Construction of open-hearth-furnace ports



NW. M, 1924. 1,515,462

G. L. DANFORTH, JR

CONSTRUCTION OF OPEN HEARTH FURNACE PORTS Filedkst. 9, 1922 2 Sheets-Shesl Nov. u, i924. 1,515,462

G. L. DANFORTH, JR

CONSTRUCTION OF OPEN HEARTH FURNACE PORTS Filed Oct. 9, 1922 2 shee1ssheez 2 of combustion.

Patented Nov. ll, 1924i.

HT TA' GEORGE L. DANFORTH, JR., OF CHICAGO, ILLINOIS.

CONSTRUCTION OF .OPEN-HEARTH-FURNACE PORTS.

Application 1ed0ctober`9, 19.212. Serial No. 593,277.

To'all whom t may concern:

Be it known that I, GEORGE L. DANFORTH, Jr., a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in the Construction of Open-Hearth-Furnace Ports, of which the following is a specification.

This invention relates to a new and improved construction of open hearth furnace ports and more particularly to a construction involving the use of applurality of gas ports associated with a damper controlled A air port.

As is well known in the art, open hearth furnaces are double ended and are reversed in operation, each end serving alternately to introduce the fuel and air and to carry off the products of combustion. The products of combustion largely exceed in volume the incoming air and fuel and consequently the ports must, be designed with a view of carrying off the larger volume of the products It is, however, necessary for ecient operation that the incoming air and fuel be properly intermingled and controlled to form a relatively short, hot flame properly directed upon the bath of metal in the furnace.

Certain furnaces have been designed with damper controlled ports upon each end of the furnace, these ports being closed olf upon the incoming end and servin on the outgoing end to aid in carrying off t e products of combustion.' A furnace of this type is shown in the patent to McKune, No. 1,339,855, datedMay 11, 1920. In these furnaces, two dampers are required, one in each of the supplemental discharge passages, and these dampers not only complicate the installation but due to their water-cooling, in-

-volve considerable heat losses.

` It is desirable in open hearth furnaces to separate the incoming fuel at each end -of the furnace into a plurality of small streams since the small streams will more readily mix with the air and will give a more rapid combustion. Another advantage of divided streams lies in their greater eciency in melting down a charge. A single central flame will be broken up by impinging upon the charge and will be deflected tothe walls and roof. rIvhis results not only in inecient heating but in damage to the furnace walls and roof. Cn the other hand the divided streams will meet upon the piled up charge and will efficiently melt it down. In the construction 'of separate ports the vfurnace side walls may be utilized as port walls so that but little additional brickwork is required over a single port furnace.

It is an object of the present invention to provide a new and improved ort construction wherein the intermingle fuel and air are introduced in a plurality of streams.

It is an additional ob] ect to provide a construction of this type wherein additional, selectively enlarged port area is provided for carrying off the products of combustion.

It is an additional object to provide a construction of this type in which the air passages communicate with the fuel and air ports, means being provided for selectively directing the air into the combined ports.

Other and further objects will appear as the description proceeds.

I have illustrated a preferred embodiment of my invention in the accompanying drawings, in which l Figure 1 is a vertical longitudinal section showing one end of my furnace construction;

Figure 2 is a horizontal section taken on line 2 2 of Figure l;

Figure 3 is a transverse section line 3 3 of Figure 1; and

Figure 4c is a transverse sect-ion taken on line 4f-4: of Figure 1.

It will be understood that the usual regenerative chambers and passa es will be provided in connection with the urnace, but these chambers form in themselves no art of alle present'invention and have not een shown.

The slag pocket 7 is connected by uptake passage 8 with the central port 9 of the furnace. The/ gas slag pocket 1() is connected by the passages 11 with the two lateral ports 12. The uptake 8 is connected with the ports 12 by the lateral passages 13, these passages entering the rear of the ports. The central port 9 is controlled by the vertically inovable damper 14 which moves in water-cooled guides 15I and is provided with the housing 16 extending above the furnace roof. The nozzles 17 indicated in dotted lines may be provided for the introduction of liquid fuel or coke oven gas, if such fuels are used.

The lateral ports 12 incline inwardly toward the center line of the furnace as best taken on shown in Figure 2 and the furnace Walls inoline inwardly at 18 to meet the outer wall of the, lateral ports sothat a substantially continuous wall is formed Withy the smallest cross-sectional area of the furnace located immediately in advance of the ports.

As shown in the drawings, the invention has been applied' to a tilting furnace, the furnace body 19 being separated from the furnace ends containing the ports. Obviously, the invention may be applied -to fixed furnaces Without change in the port construction from that shown.

In the operation ofthe furnace, the gas will be preheated in the usual regenerators and will pass up from slag pocket 10 through uptakes 11 into the ports 12. rfhe air will be preheated and reach the slag pocket 7 from the regenerators. From the slag pockets 7, it will pass through uptake S into the rear of the port 9. 'The damper 14 will be lowered to block olf the central port and the air will pass through the lateral passages 13 into the rear end of the ports 12. The air will mingle with the gas coming up' into the ports and the mixture of air and gas Will issue from the mouths of the ports. rlhese ports are the proper size to give an adequately controlled flame and their inward inclination is such as to properly direct the flame upon the bath of metal in the furnace. lf it is desired to use coke 4 oven gas or liquid fuel, no gas Willl come l regenerators By raising the `damper 14 upon the out- `going end, the area available for passage of the products of combustion is greatly increased over that provided on the incoming end for the air and fuel. This greater area permits the products of combustion to be. carried of Without the necessity for the provision of auxiliaryldraft means. The ports used for the introduction of the air and fuel may be of such area and contour Lei-sees as to provide an efficient and adequately controlled and directed flame.

l claim:

1. in a reversible regenerative furnace, a plurality of fuel ports located adjacent the side Walls of the furnace, an air passage, a discharge port located intermediate said fuel ports, and passages connect-ing the air passage and fuel ports.

2. In a reversible regenerative furnace, a plurality of fuel ports located adjacent the side walls of the furnace, an air passa-ge, a port located intermediate said fuel ports, passages connecting the air passage and fuel ports, and a damper controlling the intermediate port.

3. ln a reversible regenerative furnace, a plurality of fuel ports located adjacent the side Walls of the furnace, fuel passages entering the fuel ports, an air passage and a port connected thereto located' intermediate the fuel ports and passages connecting theV air passage and fuel ports, said passages yentering the fuel ports in the rear of the entrance of the fuel passages into said ports.

4f. ln a reversible regenerative furnace, a plurality of fuel ports located adjacent the side Walls o f the furnace, an air uptake and port connected thereto located intermediate said fuel ports and laterally extending passages connecting the uptake and the rear of the fuel ports.

5. ln a reversible regenerative furnace, a plurality of fuel ports located adjacent the side walls of the furnace, fuel passages entering the fuelports, an air passage and a port connectedthereto located intermediate the fuel ports, passages connecting the air passage and fuel ports, said passages entering the fuel ports in the rear of the entrance of the fuel passages, into said ports, and a movable damper adapted to close the air port.

6. In a reversible regenerative furnace, a plurality of fuel ports located adjacent the side walls of the furnace, an air uptake and a port located intermediate said fuel ports,-

laterally extending passages connecting the air uptake and the rear of the fuel ports, and a movable damper adapted to close the intermediate port and to deflect the air into the laterally extending passages.

Signed at Chicago, Illinois` this 4th day of October, 1922.

GEORGE L. DANFORTH, J n. 

